Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
BACK
As described in historical dictionaries
Patronymica Britannica (1860)
BACK. (Pluralized to Backs, whence Bax.) Sometimes sjTionymous with Beck, but more generally either a wharf or a ferry. Hence Backman and Backer.
Surname type: Nickname
Origin: English
Region of origin: British Isles
Country of origin: England
Religion of origin: Christian
Language of origin: English